173 0306 6z 2003 Ford Mustang Mach 1 Engine

Although similar to the 4.6 DOHC used in the '01 Cobra, the Mach 1's powerplant has been enhanced with high-flow four-valve heads, new performance cams, and improved exhaust manifolds. Low-end torque doesn't match the Cobra, but it screams at higher rpm.